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From "Pierre Bourret (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FELIX-4116) Ability to listen for component service dependencies, providings, configuration properties, ...
Date Wed, 12 Jun 2013 13:53:20 GMT

    [ https://issues.apache.org/jira/browse/FELIX-4116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13681228#comment-13681228
] 

Pierre Bourret commented on FELIX-4116:
---------------------------------------

Work started here : https://github.com/bourretp/felix/tree/feature/component-listeners

Already got listeners for provided services and configuration.
For configuration, listeners are called when an _external_ reconfiguration_ occurs. Notifying
listeners each time the POJO change a field value would dramatically slow down the component
and expose inconsistent intermediate state to the listeners.

Listeners on service dependencies are ongoing...
                
> Ability to listen for component service dependencies, providings, configuration properties,
...
> -----------------------------------------------------------------------------------------------
>
>                 Key: FELIX-4116
>                 URL: https://issues.apache.org/jira/browse/FELIX-4116
>             Project: Felix
>          Issue Type: New Feature
>          Components: iPOJO
>         Environment: N/A
>            Reporter: Pierre Bourret
>
> iPOJO offers the ability to be notified when a service arrives/is modified/leaves a dependency.
However this notifications happens _inside_ the component, via dependency callbacks (@Bind,
@Unbind, @Modified).
> What would be cool is to listen to this events _externally_, with listeners on the DependencyModel.
> Is is possible right now to do this with a hack of the DependencyCallbacks (lots of reflection,
ugly code).
> So what just lacks is the API to register/unregister listeners + the listener interface.
> Same thing for service providings : we should be able to be notified when a component
start/stop to provide a service. It is possible to listen to all services with the good "instance.name",
but this is not really elegant, and there might be issues with isolated ServiceContext (composite).
Registering a listener on the ProvidedService seems a better approach IMO.
> Same point for configuration, like the @Updated callback, but external.
> For sure there are lots of other component things to listen to... ;)

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